"Come on, Sarah." Once more, Sarah Palin came to Iowa. Once more, it was for a book signing. This time it was at the WalMart in Spirit Lake. Again, no questions allowed by media (local or national) and no opportunities for possible 2012 caucus-goers to get close and ask what's on their minds. Supporters -- like those standing in line today in Spirit Lake -- don't mind that. In fact, the people we saw were delighted to meet the former governor of Alaska. Palin, in an apparent great mood, joked with people in line, shook hands and even autographed one...